#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2021/3/15 11:33
# @Author  : Wang Yuhang
# @File    : views.py
# @Func    : 路由处理程序

from datetime import datetime
from flask import render_template, session, redirect, url_for, flash, current_app, abort, request, make_response
from flask_login import login_required, current_user

from . import main
from .forms import NameForm, EditProfileForm, EditProfileAdminForm, PostForm, CommentForm
from .. import db
from ..models import User, Permission, Role, Post, Comment
from ..email import send_email
from ..decorators import admin_required, permission_required
from flask_sqlalchemy import get_debug_queries


@main.after_app_request
def after_request(response):
    for query in get_debug_queries():
        if query.duration >= current_app.config['FLASKY_SLOW_DB_QUERY_TIME']:
            current_app.logger.warning(
                'Slow query: %s\nParameters: %s\nDuration: %fs\nContext: %s\n'
                % (query.statement, query.parameters, query.duration,
                   query.context))
    return response


@main.route('/shutdown')
def server_shutdown():
    if not current_app.testing:
        abort(404)
    shutdown = request.environ.get('werkzeug.server.shutdown')
    if not shutdown:
        abort(500)
    shutdown()
    return 'Shutting down...'


@main.route('/moderate/enable/<int:id>')
@login_required
@permission_required(Permission.MODERATE_COMMENTS)
def moderate_enable(id):
    comment = Comment.query.get_or_404(id)
    comment.disabled = False
    db.session.add(comment)
    return redirect(url_for('.moderate',
                            page=request.args.get('page', 1, type=int)))


@main.route('/moderate/disable/<int:id>')
@login_required
@permission_required(Permission.MODERATE_COMMENTS)
def moderate_disable(id):
    comment = Comment.query.get_or_404(id)
    comment.disabled = True
    db.session.add(comment)
    return redirect(url_for('.moderate',
                            page=request.args.get('page', 1, type=int)))


@main.route('/moderate')
@login_required
@permission_required(Permission.MODERATE_COMMENTS)
def moderate():
    page = request.args.get('page', 1, type=int)
    pagination = Comment.query.order_by(Comment.timestamp.desc()).paginate(
        page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'],
        error_out=False)
    comments = pagination.items
    return render_template('moderate.html', comments=comments,
                           pagination=pagination, page=page)


@main.route('/all')
@login_required
def show_all():
    resp = make_response(redirect(url_for('.index')))          # 创建响应对象
    resp.set_cookie('show_followed', '', max_age=30*24*60*60)  # 30天
    return resp


@main.route('/followed')
@login_required
def show_followed():
    resp = make_response(redirect(url_for('.index')))
    resp.set_cookie('show_followed', '1', max_age=30*24*60*60)
    return resp


@main.route('/followed_by/<username>')
def followed_by(username):
    """
    关注的人列表
    :param username:
    :return:
    """
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash("无效的用户!")
        return redirect(url_for('.index'))
    page = request.args.get('page', 1, type=int)
    pagination = user.followed.paginate(
        page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'],
        error_out=False)
    follows = [{'user': item.followed, 'timestamp': item.timestamp} for item in pagination.items]
    return render_template('followers.html', user=user, title="关注",
                           endpoint='.followed_by', pagination=pagination,
                           follows=follows)


@main.route('/followers/<username>')
def followers(username):
    """
    粉丝列表
    :param username:
    :return:
    """
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash("无效的用户!")
        return redirect(url_for('.index'))
    page = request.args.get('page', 1, type=int)
    pagination = user.followers.paginate(
        page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'],
        error_out=False)
    follows = [{'user': item.follower, 'timestamp': item.timestamp} for item in pagination.items]
    return render_template('followers.html', user=user, title="粉丝",
                           endpoint='.followers', pagination=pagination,
                           follows=follows)


@main.route('/unfollow/<username>')
@login_required
@permission_required(Permission.FOLLOW)
def unfollow(username):
    """
    取关操作
    :param username:
    :return:
    """
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash("无效的用户!")
        return redirect(url_for('.index'))
    if not current_user.is_following(user):
        flash("你没有关注此用户！")
        return redirect(url_for('.user', username=username))
    current_user.unfollow(user)
    db.session.commit()
    flash('你取消关注了 {username} !'.format(username=username))
    return redirect(url_for('.user', username=username))


@main.route('/follow/<username>')
@login_required
@permission_required(Permission.FOLLOW)
def follow(username):
    """
    关注操作
    :param username:
    :return:
    """
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash("无效的用户!")
        return redirect(url_for('.index'))
    if current_user.is_following(user):
        flash("你已关注此用户！")
        return redirect(url_for('.user', username=username))
    current_user.follow(user)
    db.session.commit()
    flash('你关注了 {username} !'.format(username=username))
    return redirect(url_for('.user', username=username))


@main.route('/edit/<int:id>', methods=['GET', 'POST'])
@login_required
def edit(id):
    post = Post.query.get_or_404(id)
    if current_user != post.author and not current_user.can(Permission.ADMINISTER):  # 当前用户和管理员可以编辑文章
        abort(403)
    form = PostForm()
    if form.validate_on_submit():
        post.body = form.body.data
        db.session.add(post)
        db.session.commit()
        flash('文章已经更新！')
    form.body.data = post.body
    return render_template('edit_post.html', form=form)


@main.route('/post/<int:id>', methods=['GET', 'POST'])
def post(id):
    post = Post.query.get_or_404(id)
    form = CommentForm()
    if form.validate_on_submit():
        comment = Comment(body=form.body.data,
                          post=post,
                          author=current_user._get_current_object())
        db.session.add(comment)
        db.session.commit()
        flash('你的评论已提交！')
        return redirect(url_for('.post', id=post.id))
    page = request.args.get('page', 1, type=int)
    pagination = post.comments.order_by(Comment.timestamp.desc()).paginate(
        page, per_page=current_app.config['FLASKY_COMMENTS_PER_PAGE'],
        error_out=False)
    comments = pagination.items
    return render_template('post.html', posts=[post], form=form,
                           comments=comments, pagination=pagination)


@main.route('/', methods=['GET', 'POST'])
def index():
    form = PostForm()
    if current_user.can(Permission.WRITE_ARTICLES) and form.validate_on_submit():
        post = Post(body=form.body.data, author=current_user._get_current_object())  # 真正的用户对象
        db.session.add(post)
        return redirect(url_for('.index'))
    page = request.args.get('page', 1, type=int)                                        # 渲染的页数，默认渲染第一页
    show_followed = False
    if current_user.is_authenticated:  # show_followed存在cookies中
        show_followed = bool(request.cookies.get('show_followed', ''))
    if show_followed:
        query = current_user.followed_posts  # 是显示关注的用户的文章
    else:
        query = Post.query                   # 显示所有文章
    pagination = query.order_by(Post.timestamp.desc()).paginate(                   # 参数page，页数
        page, per_page=current_app.config['FLASKY_POSTS_PER_PAGE'], error_out=False     # 可选参数per_page每页的记录数
    )                                                                                   # 可选参数error_out，False，超出范围返回空列表
    posts = pagination.items
    return render_template('index.html', form=form, posts=posts, show_followed=show_followed, pagination=pagination)


@main.route('/admin')
@login_required
@admin_required
def for_admins_only():
    return "管理员用户界面"


@main.route('/moderator')
@login_required
@permission_required(Permission.MODERATE_COMMENTS)
def for_moderator_only():
    return "操作员用户界面"


@main.route('/user/<username>')
def user(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        abort(404)
    posts = user.posts.order_by(Post.timestamp.desc()).all()
    return render_template('user.html', user=user, posts=posts)


@main.route('/edit-profile', methods=['GET', 'POST'])
@login_required
def edit_profile():
    form = EditProfileForm()
    if form.validate_on_submit():
        current_user.name = form.name.data
        current_user.location = form.location.data
        current_user.about_me = form.about_me.data
        db.session.add(current_user)
        flash("资料已更新！")
        return redirect(url_for('.user', username=current_user.username))
    form.name.data = current_user.name          # 显示表单之前，为所有字段设定初始值
    form.location.data = current_user.location
    form.about_me.data = current_user.about_me
    return render_template('edit_profile.html', form=form)


@main.route('/edit-profile/<int:id>', methods=['GET', 'POST'])
@login_required
@admin_required
def edit_profile_admin(id):
    user = User.query.get_or_404(id)
    form = EditProfileAdminForm(user=user)
    if form.validate_on_submit():
        user.email = form.email.data
        user.username = form.username.data
        user.confirmed = form.confirmed.data
        user.role = Role.query.get(form.role.data)  # form.role.data是整数，user.role是角色id对应的角色名称
        user.name = form.name.name
        user.location = form.location.data
        user.about_me = form.about_me.data
        db.session.add(user)
        flash("个人信息已修改！")
        return redirect(url_for('.user', username=user.username))
    form.email.data = user.email
    form.username.data = user.username
    form.confirmed.data = user.confirmed
    form.role.data = user.role
    form.name.data = user.name
    form.location.data = user.location
    form.about_me.data = user.about_me
    return render_template('edit_profile.html', form=form, user=user)

